Coffee Appreciation

Can anyone think of anywhere within spitting distance of kings cross (or en route back to stoke Newington) where I can pick up some decent beans? Am running dangerously low and my usual vendors of Monmouth or nude espresso are a bit beyond a 40 ish minute lunch break dash. Is caravan on exmouth market any good?

I've had pretty good experiences with Caravan on espresso and drip filters and handily for you, they're a couple of days away from opening a new cafe in Granary square in the new CSM building.